If disks 3 and 4 were mirrored then both ought to contain valid data, they are likely to be out of sync with each other if there was any writing going on at the time but either should be usable. Tou won't need raid reconstructor since it reassembles stripes and RAID 1 doesn't have the data striped across multiple disks, just mirrored.
You rpoblem is simply to get the controller to accept one of the disks so with just one of them in and the other out it may let you put that one online, a simple file recovery program will be able to get the data but that needs a non-RAID controller to work with. Do you have something with a normal SCSI (I presume) cintroller on it that you can mount one of the drives on?